How do I prove ABCD to be a rectangle

The unit of area of a rectangle is square units. For example, if the dimensions of a rectangle are 4 inches × 3 inches. The area of the rectangle is 12 square inches.

Step-by-step explanation:

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Step-by-step explanation:

AB = DC, AE=DE, ∠BAE = ∠CDE = 90°

ΔBAE ≅ ΔCDE   (SAS)

BE = CE   .. corresponding sides of congruent triangles

∠EBC = ∠ECB  ... base angles of isosceles triangle

∠ABC = ∠ABE + ∠EBC = ∠DCE + ∠ECB = ∠DCB

∠ABC + ∠DCB = 360° - ∠CDE - ∠BAE = 360° - 180° = 180°

∠ABC = ∠ DCB = 1/2 * 180° = 90°

∴ ABCD is rectangle

answer: -8.2562234e+13

your question is incomplete, write all the numbers in the sequence that it tells you.  

step-by-step explanation: